A method for manufacturing direct reduced iron

Patent metadata

Field	Value
Publication number	US-2024254576-A1
Application number	US-202118559909-A
Country	US
Kind code	A1
Filing date	May 18, 2021
Priority date	May 18, 2021
Publication date	Aug 1, 2024
Grant date	—

Abstract

A method for manufacturing direct reduced iron wherein oxidized iron is reduced in a direct reduction furnace by a reducing gas, the oxidized iron being first mixed with biochar to form a solid compound and the solid compound is charged into the direct reduction furnace.

First claim

What is claimed is:

1 - 9 . (canceled)

10 . A method for manufacturing direct reduced iron, the method comprising:
reducing oxidized iron in a direct reduction furnace by a reducing gas, the oxidized iron being first mixed with biochar to form a solid compound; and charging the solid compound into the direct reduction furnace.

11 . The method as recited in claim 10 wherein said biochar is produced by the pyrolysis of biomass.

12 . The method as recited in claim 10 wherein the solid compound is a briquette or pellet.

13 . The method as recited in claim 10 wherein the reducing gas includes more than 50% in volume of hydrogen.

14 . The method as recited in claim 10 wherein the reducing gas includes more than 99% in volume of hydrogen.

15 . The method as recited in claim 13 wherein the hydrogen of the reducing gas is at least partly produced by electrolysis.

16 . The method as recited in claim 15 wherein the electrolysis is powered by renewable energy.

17 . The method as recited in claim 10 wherein a top reduction gas is captured at an exit of the direct reduction furnace and subjected to at least one separation step so as to be split between a CO2-rich gas and an H2-rich gas, said H2-rich gas being at least partly used as the reducing gas.

18 . The method as recited in claim 17 wherein the CO2-rich gas is subjected to a methanation step.

Assignees

• Arcelormittal

Inventors

• Tsvik George
• Boulanov Dmitri
• Reyes Rodriguez Jon
• Carrier Odile
• Salame Sarah
• Barros Lorenzo José
• Andrade Marcelo
• Lu Dennis

Classifications

• C25B1/04

  by electrolysis of water · CPC title

• C21B13/0073 Primary

  Selection or treatment of the reducing gases · CPC title

• C21B13/0066

  Preliminary conditioning of the solid carbonaceous reductant · CPC title

• C25B15/081

  Supplying products to non-electrochemical reactors that are combined with the electrochemical cell, e.g. Sabatier reactor · CPC title

• C21B2100/282

  of carbon dioxide · CPC title